GPT-5.4 Mini Users Report Output Drift

// 45d agoNEWS

GPT-5.4 Mini Users Report Output Drift

A Reddit user claims GPT-5.4 mini started leaking reasoning-like text into final answers after months of stable Home Assistant automation. OpenAI positions GPT-5.4 mini as its fastest small model for coding, subagents, and high-volume workflows, so any regression especially noticeable in production agent setups.

// ANALYSIS

My read: this sounds less like a planned model change and more like either a routing/prompting regression or an integration-layer bug that only shows up when the model is embedded in a tool chain.

–OpenAI’s own docs frame GPT-5.4 mini as a fallback in ChatGPT and a workhorse for subagents, so even small behavior shifts can ripple through automation stacks.
–The reported “thoughts” leakage fits a prompt-contamination or output-filtering issue as much as a raw model-quality drop.
–Home Assistant plus N8N adds another layer of abstraction, which makes it hard to pin the blame on the model alone without controlled A/B tests.
–If other users can reproduce it across clean API calls, that would be a stronger signal of a real model regression than a single anecdote.
–For production use, this is a reminder to keep evals, prompt guards, and output sanitizers in place even on “stable” small models.

// TAGS

openaigpt-5.4-minillmagentapiautomationspeech

DISCOVERED

45d ago

2026-04-24

PUBLISHED

45d ago

2026-04-24

RELEVANCE

8/ 10

AUTHOR

Khaaaaannnn

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